Unlock instant, AI-driven research and patent intelligence for your innovation.

Method and device for training an RF amplifier linearization device, and mobile terminal incorporating same

a technology of linearization device and rf amplifier, which is applied in the direction of power management, modulated carrier system, transmitter/receiver shaping network, etc., can solve the problem that the technique is very prejudiciable to the spectral efficiency of the radiocommunication system

Inactive Publication Date: 2010-03-16
CASSIDIAN SAS
View PDF70 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

"The invention relates to a method, device, and mobile terminal for training a device for linearizing a radiofrequency amplifier in a radiocommunication system. The training sequence is included in a sequence of symbols that are transmitted in bursts and serves to adjust the parameters of the transmission chain between the equipment. The training sequence is generated and transmitted by the first equipment and compared with a locally generated sequence to train the linearization device. The use of the training sequence allows for efficient and effective training of the linearization device without impacting the overall performance of the system."

Problems solved by technology

However, the radiofrequency power amplifier (hereinafter RF amplifier) present in the RF transmitter has a characteristic that is linear at low output power but nonlinear as soon as the power exceeds a certain threshold.
However, this procedure has several drawbacks.
This technique is therefore very prejudicial to the spectral efficiency of the radiocommunication system.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method and device for training an RF amplifier linearization device, and mobile terminal incorporating same
  • Method and device for training an RF amplifier linearization device, and mobile terminal incorporating same
  • Method and device for training an RF amplifier linearization device, and mobile terminal incorporating same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

.

[0038]Represented diagrammatically in FIG. 1 are the means of an exemplary mobile terminal according to the invention. Such a mobile terminal belongs for example to a radiocommunication system which additionally comprises a fixed network having base stations.

[0039]The terminal comprises a transmit chain 100, a receive chain 200, a control unit 300, a permanent memory 400, as well as an automatic gain control device 500 (AGC) associated with an RF receiver of the receive chain 200.

[0040]The transmit chain 100 comprises a useful-data source 10, for example a speech coder delivering voice-coding data. The source 10 is coupled to an M-ary data modulator 20 which provides for the baseband modulation of the data to be transmitted according to a modulation with M distinct states, where M is a determined integer. The binary data which it receives from the source 10 are translated by the modulator 20 into symbols belonging to an M-ary alphabet, that is to say comprising M distinct signals. ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

a method whereby a linearization training sequence is designed to be transmitted by means of a radiofrequency transmitter incorporated in a mobile terminal or a base station of a radiocommunication system comprising a fixed network. The sequence is adapted for transmitting bursts in accordance with a specific frame structure. Besides, the sequence is included in a sequence of symbols further designed to enable the transmission chain parameters to be adjusted.

Description

BACKGROUND OF THE INVENTION[0001]1. Technical Field[0002]The present invention relates to the linearization of radiofrequency (RF) power amplifiers. It finds applications, in particular, in the RF transmitters of the mobile terminals of digital radiocommunication systems. It may also be applied in the RF transmitters of base stations in particular during the first startup of such a station.[0003]2. Related Art[0004]In current digital radiocommunication systems, one seeks to send information with a maximum throughput in a given RF frequency band which is assigned to a transmission channel (hereinbelow radio channel). To do this, the modulations that have been used for a few years comprise a phase or frequency modulation component and an amplitude modulation component.[0005]Moreover, radio channels coexist in a determined frequency band allotted to the system. Each radio channel is subdivided into logical channels by time division. In each time interval (or time slot), a group of symb...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(United States)
IPC IPC(8): H04K1/02H04L27/00H03F1/32H04B7/005
CPCH03F1/3247H04W52/52
Inventor TOUCHAIS, SANDRINECHECOURY, XAVIER
Owner CASSIDIAN SAS